Optical: systems and elements – Holographic system or element – Using modulated or plural reference beams
Patent
1990-02-16
1992-04-21
Arnold, Bruce Y.
Optical: systems and elements
Holographic system or element
Using modulated or plural reference beams
359 19, 359 29, 359 66, 359256, 359561, 382 31, 382 42, G02B 530, G02B 2746
Patent
active
051073510
ABSTRACT:
An image enhanced optical correlator system providing for optical preprocessing of an input image prior to processing thereof in an optical correlator. The optical preprocessing is provided to enhance the image and/or image related characteristics such that the probability of detection of prescribed targets therein in the optical correlator is increased. In the system, an input image beam is split into orthogonally polarized image inputs, processed to enhance targets therein, and then the algebraic result (addition and/or subtraction) thereof is processed through an optical correlator. Techniques are used in the feedback systems to enhance the output plane correlation signal detection by an adjustment in phase, spatial frequency filtering and/or threshold setting optimization.
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Leib Kenneth G.
Pernick Benjamin J.
Arnold Bruce Y.
Grumman Aerospace Corporation
Shafer R. D.
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